<template>
  <div>
    <div class="user-info-head" @click="editCropper()">
      <img class="img-circle" :src="options.img" title="点击上传头像" />
    </div>

    <el-dialog title="修改头像" :visible.sync="open" width="800px" append-to-body @opened="modalOpened()"
      @close="closeDialog()">

      <el-row>
        <el-col :xs="24" :md="12" :style="{ height: '350px' }">
          <!-- realTime函数后不能加() -->
          <vue-cropper ref="cropper" :img="options.img" :info="true" :autoCrop="options.autoCrop"
            :autoCropWidth="options.autoCropWidth" :autoCropHeight="options.autoCropHeight" :fixedBox="options.fixedBox"
            :outputType="options.outputType" @realTime="realTime" v-if="visible" />
        </el-col>

        <el-col :xs="24" :md="12" :style="{ height: '350px' }">
          <div class="avatar-upload-preview">
            <img :src="previews.url" :style="previews.img" />
          </div>
        </el-col>
      </el-row>
      <br />

      <el-row>
        <el-col :lg="2" :sm="3" :xs="3">
          <!-- beforeUpload函数后不能加() -->
          <el-upload action="#" :http-request="requestUpload" :show-file-list="false" :before-upload="beforeUpload">
            <el-button>
              选择 <i class="el-icon-upload el-icon--right"></i>
            </el-button>
          </el-upload>
        </el-col>

        <el-col :lg="{ span: 1, offset: 2 }" :sm="2" :xs="2">
          <el-button icon="el-icon-plus" @click="changeScale(1)"></el-button>
        </el-col>
        <el-col :lg="{ span: 1, offset: 1 }" :sm="2" :xs="2">
          <el-button icon="el-icon-minus" @click="changeScale(-1)"></el-button>
        </el-col>
        <el-col :lg="{ span: 1, offset: 1 }" :sm="2" :xs="2">
          <el-button icon="el-icon-refresh-left" @click="rotateLeft()"></el-button>
        </el-col>
        <el-col :lg="{ span: 1, offset: 1 }" :sm="2" :xs="2">
          <el-button icon="el-icon-refresh-right" @click="rotateRight()"></el-button>
        </el-col>
        <el-col :lg="{ span: 2, offset: 6 }" :sm="2" :xs="2">
          <el-button type="primary" @click="uploadImg()">提 交</el-button>
        </el-col>
      </el-row>
    </el-dialog>
  </div>
</template>

<script>
import { uploadPic } from "@/api/tool/file";
import { updateUser } from "@/api/user/user";

import { VueCropper } from "vue-cropper";
import { debounce } from "@/utils";

export default {
  components: {
    VueCropper,
  },
  data() {
    return {
      // 是否显示弹出层
      open: false,
      // 是否显示cropper
      visible: false,
      options: {
        img: process.env.VUE_APP_DOWNLOAD_URL + this.$store.getters.userInfo.userCover, //裁剪图片的地址
        autoCrop: true, // 是否默认生成截图框
        autoCropWidth: 200, // 默认生成截图框宽度
        autoCropHeight: 200, // 默认生成截图框高度
        fixedBox: true, // 固定截图框大小 不允许改变
        outputType: "png" // 默认生成截图为PNG格式
      },
      previews: {},
      resizeHandler: null
    };
  },
  methods: {
    // 编辑头像
    editCropper() {
      this.open = true;
    },
    // 打开弹出层结束时的回调
    modalOpened() {
      this.visible = true;
      if (!this.resizeHandler) {
        this.resizeHandler = debounce(() => {
          this.refresh()
        }, 100)
      }
      window.addEventListener("resize", this.resizeHandler)
    },
    // 刷新组件
    refresh() {
      this.$refs.cropper.refresh();
    },
    // 向左旋转
    rotateLeft() {
      this.$refs.cropper.rotateLeft();
    },
    // 向右旋转
    rotateRight() {
      this.$refs.cropper.rotateRight();
    },
    // 图片缩放
    changeScale(num) {
      num = num || 1;
      this.$refs.cropper.changeScale(num);
    },
    // 覆盖默认的上传行为
    requestUpload() {
    },
    // 上传预处理
    beforeUpload(file) {
      console.log(file);
      if (file.size > 10 * 1024 * 1024) {
        this.$message.warning('封面大小不能超过10M');
        return 0;
      }
      if (file.type.indexOf("image/") == -1) {
        this.$message.warning('文件格式错误！请上传图片类型,如：.jpg .png .jpeg .gif 后缀的文件!');
        return 0;
      }
      const reader = new FileReader();
      reader.readAsDataURL(file);
      reader.onload = () => {
        this.options.img = reader.result;
      };
    },
    // 上传图片
    uploadImg() {
      this.$refs.cropper.getCropBlob(data => {
        let formData = new FormData();
        formData.append("file", data);
        formData.append("type", 2);
        // 上传图片接口
        uploadPic(formData).then(res => {
          this.open = false;
          this.options.img = process.env.VUE_APP_DOWNLOAD_URL + res.data.data;
          // 更新用户信息接口
          let userTestEntity = { "userCover": res.data.data };
          this.$store.commit('SET_USER_COVER', res.data.data);
          updateUser(userTestEntity).then(res => {
            this.$message.success('上传头像成功!');
            this.visible = false;
          })
        })
          .catch((res) => {
            this.$message.error('上传有失败部分，请重新上传!');
          });
      });
    },
    // 实时预览
    realTime(data) {
      this.previews = data;
    },
    // 关闭窗口
    closeDialog() {
      this.visible = false;
      window.removeEventListener("resize", this.resizeHandler)
    }
  }
};
</script>

<style>
.user-info-head {
  position: relative;
  display: inline-block;
  width: 100px;
  height: 100px;
}

.user-info-head:hover:after {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  content: '+';
  font-size: 24px;
  text-align: center;
  width: 100px;
  height: 100px;
  line-height: 100px;
  border-radius: 50%;
  color: #eee;
  background: rgba(0, 0, 0, 0.5);
  cursor: pointer;
}

.img-circle {
  width: 100%;
  height: 100%;
  border-radius: 50%;
}

.avatar-upload-preview {
  position: relative;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 200px;
  height: 200px;
  border-radius: 50%;
  box-shadow: 0 0 4px #ccc;
  overflow: hidden;
}
</style>
